package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增购物车操作
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断已经存在了，只需要数量加一
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，需要插入一条数据
            //查询本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //添加菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //添加套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> shoppingCart() {
        Long userid = BaseContext.getCurrentId();
        ShoppingCart build = ShoppingCart.builder().userId(userid).build();
        List<ShoppingCart> list = shoppingCartMapper.list(build);
        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long userid = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userid);
    }

    @Override
    public void putById(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list!=null && list.size()>0){
            Integer number = list.get(0).getNumber();
            if (number>1){
                //一个以上商品，商品数量减一
                ShoppingCart cart = list.get(0);
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            }else {
                //一个商品，直接删除该商品购物车信息
                shoppingCartMapper.deleteByShoppingCart(shoppingCartDTO);
            }
        }

    }
}
